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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_H_
#define CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_H_
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
class WebContents;
}
class Browser;
class HandoffActiveURLObserverDelegate;
class TabStripModel;
// This class observes changes to the "active URL". This is defined as the
// visible URL of the WebContents of the selected tab of the most recently
// focused browser window.
class HandoffActiveURLObserver : public chrome::BrowserListObserver,
public TabStripModelObserver,
public content::WebContentsObserver {
public:
explicit HandoffActiveURLObserver(HandoffActiveURLObserverDelegate* delegate);
~HandoffActiveURLObserver() override;
private:
// chrome::BrowserListObserver
void OnBrowserSetLastActive(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
// TabStripModelObserver
void ActiveTabChanged(content::WebContents* old_contents,
content::WebContents* new_contents,
int index,
int reason) override;
void TabStripModelDeleted() override;
// content::WebContentsObserver
void DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) override;
void WebContentsDestroyed() override;
// This method ensures that the instance is registered as an observer of the
// correct TabStripModel and WebContents for |active_browser_|.
void UpdateObservations();
// Makes this object start observing the TabStripModel, if it is not already
// doing so. This method is idempotent.
void StartObservingTabStripModel(TabStripModel* tab_strip_model);
// Makes this object stop observing the TabStripModel.
void StopObservingTabStripModel();
// Makes this object start observing the WebContents, if it is not already
// doing so. This method is idempotent.
void StartObservingWebContents(content::WebContents* web_contents);
// Makes this object stop observing the WebContents.
void StopObservingWebContents();
// Returns the active WebContents. May return nullptr.
content::WebContents* GetActiveWebContents();
// Instances of this class should be owned by their |delegate_|.
HandoffActiveURLObserverDelegate* delegate_;
// When this pointer is not nullptr, this object is registered as an observer
// of the TabStripModel.
TabStripModel* active_tab_strip_model_;
// This pointer is always up to date, and points to the most recently
// activated browser, or nullptr if no browsers exist.
Browser* active_browser_;
DISALLOW_COPY_AND_ASSIGN(HandoffActiveURLObserver);
};
#endif // CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_H_
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